282 Evolution and Adaptation 



The seeds were sown, and in turn yielded plants which when 

 self-fertilized gave four kinds of seeds (which frequently all 

 appeared in the same pod). Thus 556 seeds were produced 

 by 15 plants, having the following characters : — 



AB 315 round and yellow 

 Ab 1 01 angular and yellow 

 aB 108 round and green 

 ab 32 angular and green 



These figures stand almost in the relation of 9 : 3 : 3 : 1. 

 These seeds were sown again in the following year and 

 gave : — 



From the round yellow seeds : — 



AB 38 round and yellow seeds 

 ABb 65 round yellow and green seeds 

 AaB 60 round yellow and angular yellow seeds 

 AaBb 138 round yellow and green, angular yellow 

 and green seeds 



From the angular yellow seeds : — 



aB 28 angular yellow seeds 



aBb 68 angular yellow and green seeds 



From the round green seeds : — 



Ab 35 round green seeds 

 Aab 67 round angular seeds 



From the angular green seeds : — 

 ab 30 angular green seeds 



Thus there were 9 different kinds of seeds produced. 

 There had been separated out at this time 38 individuals 

 like the parent seed plant, AB, and 30 like the parent 

 pollen plant, ab. Since these had come from similar seeds 

 of the preceding generation they may be looked upon as 

 pure at this time. The forms Ab and aB are also constant 



